What is the best/easiest freeware speaker and filter modelling program?

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What is the best/easiest freeware speaker and filter modelling program?
This is for modelling active filters with speakers (basic sealed and vented designs) together and providing amplitude, phase, group delay, speaker power, cone extension etc vs frequency.
WinISD seems to do some of this but not all AFAIK.
Thanks,
 
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